Question

In the endothermic reaction 2NOBr(g) = 2NO(g) + Br2(g) at equilibrium, which of the following changes will result in an increase in the partial pressure of NOBr? 1. decreasing the partial pressure of Br2 II. increasing the size of the reaction vessel III. lowering the overall temperature of the reaction IV. adding a catalyst V. adding He(g) O A I and II I and II O B lland III O c IV and V IV and V III and V O E All five factors will increase the partial pressure of NOBr

Answer 1

Given reaction , 2 NOB: (g) = 2 NOCG) + Brz (9) it is endothermic reaction means. temperature of reactant side will be high. - Consider option (1) - when partial pressure of Bre will increases than according to le-chatelier - principle, equilibrium will to word right to increase the partial pressure of Br2 - so, partial pressure of NoBr will decreases. - Note: - le-chatelier principle: - according to this - principle any physical change in a - system will result in opposing changes in - the system in order to achieve a new equilibrium state. syve leasee Pm

Consider II when side of reaction vessel increases then equilibrium will shift on that side where there are more moles.. Hence equlibrium will shift toword right. Hence partial pressure y NOB will decreases. Consider 1 when temperature will decreases then. equilibrium to word left becouse on left temperature is ligh (Endothermisc) Hence, partial pressure of NoBr increases Consider iv adding a catalyst willer no equilibrium, qui effect the -

um the consider v to adding Hely) to the system, will increases the pressure, so equlibrio To will shift toward left to lower to pressure because in left there are fewer role. - Hence partial pressure og NoBr will increase: so option (0) will be correct.
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